Epson 3865X Plus - Manual (Page 243)

4. Position power supply connector P4 so that the large tab on
the connector faces the right side of the computer.
Beginning with the six pins in the socket toward the back of
the computer, carefully line up the holes in the connector
with the pins in the socket. Make sure the holes fit over all
the pins and then push the connector onto the pins.
Caution
If you do not correctly align the holes with the pins in
the socket, you could severely damage your computer
when you push in the connector.
5. Connect power supply connector P5 to the remaining six
pins in the socket using the same procedure.
6. Still holding up the subassembly, locate the hard disk drive
and diskette drive ribbon cables. (The hard disk drive cable
is slightly wider than the diskette drive cable.) Check the
back of the drives to make sure you know which cable is for
the diskette drive(s) and which is for the hard disk drive(s).
B-52
Installing and Removing Disk Drives